Sophomoric, the problem is finding a 3MHz unit that produces an intensity of even .5W/cm^2, let alone 1 or 1.5W/cm^2, which is preferable. All the 3MHz devices that I could find (that cost below $800) were designed for skin/beauty asthetics, and would not serve our purpose here. It’s even hard to find 1MHz devices that produce a decent intensity without paying for a professional machine, but there are a handful of them.
The way things are looking, though I’d prefer a 3MHz device, I think it makes more sense for me to use a 1MHz device which has a decent intensity output. Most of the 3MHz devices don’t even provide information on the intensity output, but merely say “comes with 3 intensity settings, low, med and high, so you’ll be covered on all bases!!!” - yeah, all bases under .3W/cm2…
Though a 1MHz ultrasound is likely to be most effective at levels deeper than what we’re thinking of, I think this can be circumvented buy buying a gel-pad of approximately an inch’s thickness.
I would be very careful when attempting to clamp while using ultrasonic heating. I’ve read in a number of places that ultrasound should not be used in ischemic tissue as it can be dangerous, I’m not sure on the mechanics though.